Brake apparatus for traction-elevators.



lnouniell on a shall lo anil adapten late in lle:lll;sl;1j; lf3?, SST wlan-ll lllay be sus DAVD L, LNDQXST, DLE YONKEES, ALLEE C.

JOHN, GF YOHKERS, NEW YGRK',

enema APPARATUS i pacification of Letters Patenti FOR TRACTION-ELEVATORS.

ppliee/aon lilell Gelaber 21.*?, 1998. Serial No. 459,346.

To all w/o'm, zlim/3; @on :fl lle it known tllal we, lsrvln omer, a sub'jee of Auml: C. SMITH., a eilizen of the Unileiil Stilles, and Gnirrrrn JOHN, a subject o the King ol' England, residing al. Yonkers, New York, New' York city, New York, andA Yonlrelsj 'New York, 'lesi-eeively, llave irlventell a new and useful improvement; in Brake Apparatus fior 'fraction-BHWators, of which tlle llllowing' is a Speeification.

Our invention relates to improvements in elevator llmkes5 wllieli are adapted to llave a general applicaliona liutsolne features of which are especially designed for use in eenneetion with traction or direct drive elevaiors and other llllistillg; apparatus.

(lne object of our imenrion ie lille provision fr means for 'the separate :unl inflepenrlent arljilslinent of parte.

A, lfnrller oll'dieel, .ie to facilitate lille remoral and replacing of worn out or broken parte Without disturbing ille relllaincler or tlle brake apparatus.

Other objects of the invention will appear hereinafter, *alle novel combinations of elements being set forth in lle appended claim.

In tlle aeeoln'lanjy'ing drawings, Figure l illustl'aies 'in side elevation all electric motor with ille allilplicalien of our invention there to; Fig. 2 is a sectional View of Fig. Il. taken on the line a fb lookingF in ille llireei'ion of tile arrows; anil Figi, 2 ES a ilelail nl eolllleen lions lleli. en Lllo lll'alw. level' zlllll alle releasing magnet.

lelel-l" lg u) tile lllanillgf" .lli il un eleelrle roeier, ille :lim-laire (l and ll. of wllilll l 'e allalllvrl 1.o l'oale in limi ings (El and l l? le :l rl'om'ell Callie elleave illollneli upon elle :illllallll'e .fllall ll asili millier s willi il Silllilfil gwolfml Callie :Allez-:ve 135i .llllell is i l il) Ml L. Liso nenrlell il'olll tlle fiom? l2y liv ellannel beam;` l A L' 14, la, el' leealerl 1n any other desirable position.

.l (leeipjllalle the leales apparatus wllwll is preferably lof'alifll a5 near ille llloiol M :le poselole l desfffzlaws ille lnalna pillley ivlnell is lilollnlerl il mi lll@ illolol llaiL ll allll lieyell L --Ui um.; fg". bnl, oi olllelalel, @einer lahm. All, 1.1

elle King of Swedein;

: ipparalns l e' *reprises We brake le" and 3S pivobed to brackets 59, 5%', reep lively, Wlliell are secured to 'elle lied l0 by bells or otherwise. As shown, the brake 3D- ;zwe'ntlls is vljnmetrieally eenstiue'terl. r er/l'llion of the left-hand perlion Vwill :wie o the rigll-llallrl por'iion so far as screwed into a slatiellary bracket GO and lorleljl in positiol'l luy the nl-lts 61. If flesirerl, a sillgle roll extending through ille bracket. l5() may be Seel inplaee of a rml on each side. i

4G designates a brake shoe Wlliell is pivo ed at il to a sliding bleek l2 which is oontainell in and adapted to slide in a recess or slot 4:3 provided 1n the brake lever A..

compression spring bears against 'the bottom of lille recess; 43 and the sliding block 42 thereby holding the latter against an adjusting Het screw 40 which is locked in position by the mit 411. A setsereW 52 and lock nut 53 are provided toward the lower 'end of the brake level: 3Q, and 4are adapted to regulate ille tension of a Spring 55 which lies in a recess 5i in ille brake lever and bears against llle lmvel' portion of the brake sl'loe 46.

Lli rlemigilales a lll'alle band, the inner face ol wllifll is preferably lined 'with leather or miler Sllilallle material seem-ely fastened {lleve-io. yl`lle enlls of ille brake band a?? are arl'illstallly secured to the brake slloe. The seeming means lllereioiill tlliS inet-allee Comm prises a lglraelrel 5() :1L each end of tile lor-alie laval wllii'll brzlelies are rigid With ille llrale isanllf and tlllollgl. eaell of wlliel'l a lilearlell screw 5l, One end of eaell screw] il is slfxzvell into 'elle brake slloe 4G, while locking' nnte 72 are provided on the screws il al. ..lle facce ef 'tlle brackets 50 adjacent to ille brake slloe. l

"l`lll llralle levers 35.), 39 and their connev'lell parte are preferably operaled by an electronlaglleL although manual or einer well-known means may be used arlvarltaA eemlsly if so desired. The eleellonlagnet llerein elif/wn comprises a ille-guet frame i5 Pal-mwa July; "s, elle shoes and connections are eon-A solenoid which operates when energized to effect the release oi' the brake, thereby allowing the brake pulley P to turn freely.

1'? 17 designate magnet cores which are similar in every respect and are arranged to move freely in the central hole through the magnet frame and inclosed solenoid. Each core 17, 17 is formed with a head 19 of larger diameter than the core body adjacent which are resilient Washers 18 of leather or other suitable material. A stem 25 is screwed into each`core at one end and locked in place by means of a locking nut 24. The outer end 26 of the stem 25 is enlarged and flattened, and a hole is drilled therein to receive a pin 28, (Fig. 3). Located on opposite sides of the flattened portion 2G' are links 27, pivoted by means of the pin 28 extending through the links and the part 26. A bolt 29 extending through an enlarged opening Q9 in the stein 25 pivotally connects the inner ends of the links 27 with a forked lever arm 2O which latter is pivoted at 30 to alstationary bracket. 31 which maybe a separate piece bolted to the magnet frame 15 or integral therewith. The lower end of thek forked lever 20 is curved so as vto reduce to aminimum the sliding movement between itself and the brake lever This curved portion forms a toe 3Q which is adapted. to engage a raised portion 33 on the brake lever. By having the point of contact ot the parts 32 and 33 substantially in a line with the pivots 30 and 58 the relative movement or sliding at the contact surfaces and consequently the fricn tion and Wear are reduced to a minimum. Preferably, both the toe 32 and raised por tion 33 are hardened steel so that they may, better withstand Wear. The forked lever Y2() on the left-hand side of the magnctfframe 15 is extended upwardly at 9 and is connected by a pin 2 to an adjustable connector 2l which is connected to a switch arm 23. The switch arm 23 which extends into a casing C mounted on top of the magnet frame,

carries an electric conduct-ing plate or bar adapted to bridge the stationary contacts 23 in the circuit ot the brake magnet coil. While the brakes are applied this switch is closed, permitting a heavy current to be sent through the brake magnet coil Whenever it is desired to release the brakes, but as themagnet cores are drawn in to release the brakes,v the switch is opened to introduce into the magnet circuit a resistance connected between the contacts Q3, and thereby reduce the current in the magnet circuit. As this method of automatically controlling the current strength in the magnot coil is well understood by those skilled in the art` further description and illus`v traiion is deemed unnecessary.

The standard `which supports the motor shaft bearing 63 extends upwardly, thereby forming a suitable support for the magnet frame 1.5 and' its connected parts. By construct-ing a tongue and groove or similar joint (l1 between the support 62 and magnet frame 15, the latter can never get out of horizontal alinement, which is a desirable feature.

The principle of operation of the brake apparatus herein illustrated and described is similar to other brake apparatus used for a like purpose, c., the brake is normally applied by spring pressure -and'is released by electric power or other means when so desired. The link connection between the magnet .cores 17, 17', and the forked levers Q0, 20', respectively, allows a straight lline movement of the magnet. cores, consequently they may be machined to a closer titin the magnet frame 15 than is the usual practice thereby greatly increasing the efficiency o the releasing magnet. The resilient Washers 18, 18', not only limit their respective magnet cores in their inward movement, but act as buffers so that noise is reduced. The tension of the brake-applying spring 35 may be readily adjusted and looked in final po sition by means of the nuts 37. In this manner any desired pressure may be transmitted through the brake lever 39 and connected brake shoe 4G and band 47 with corresponding braking eiect upon the pulley l. This adjustment is independent of the spring 85 and its adjusting means.

As hereinbetore eXpl-ai ned,tl1e slidingbloclc 42 to which is pivotally connected the brake shoe 46 is held irmly against the adjusting holt by means of the compression spring 45. In this. Way all lostmotion between the brake lever and brake shoe is taken up and the latter moves*simultaneously with the brake lever when the brake is applied When the brake is released, however-,the brake lever may move first, and motion mayA then be transmitted from the same through the. spring to the brake shoe.

That part of any brake apparatus which is subjected to the greatest amount of Wearl is invariably the brake band or other part which is in direct frictioal contact with the pcripl'xcry of the brake pulley. In the brake apparatus herein illustrated and described, the linings 48 ot the brake bands are the only parts of/'tlie apparatus which engage the brakel pulley directly, and it is those 1inings which receive substantially all of the wear when in service. Since the brake bandsx andl their linings are preferably riveted together at numerous places, it will be desir able to renew both linings and bands. Amplc provision is mada for readily doing this, all that is necessary being to unloosen the screw bolt-s 51, '51 and remove the worn out, bands and replace them with others, the entire operation requiring but a short time.y

lSO

The brake bands may be adjusted by means of either or both of the screw bolts 51 or 51.

Since the brake levers 39 and 39 are in` dependentl of each other and are-applied by separate s rings, it is readily seen that should eit er spring become damaged or broken the brake ap aratus is still operative, alth'ough its e ectiveness would be somewhat impaired. The adjusting bolt 40 varies the position of the brake shoe with respect to the brake lever, and it should be particularly noted that by reason of the bolt 40 and the parts adjustable thereby, the

brake shoes may be adjusted at frequent intervals to take up the wear on the brake leather 48 until the latter is Worn very thin. Any variation in the position of the magnet cores due to such adjustment may be readily compensated for by the adjusting means 24.

It is readily seen that a brake apparatus constructedin the manner herein set forth permits of separate and independent adj ustments of its various parts, and also provides means for readily removing and replacing worn out or broken parts without interfer ing in any way with the adjustments of ot er parts of the apparatus. Furthermore, the life of the brake leather is very .much prolonged.

- 1n addition to thebrake mechanism above described, We sometimes employ auxiliary brake mechanism B where the motor is used for lifting heavy loads or for other Work where a powerful brake may be desired. An example of Such use is found in elevator systems where the motor may be required to lift an occasional heavy load, such as a safe, when both brakes may be employed. The brake mechanism B comprises a brake pulley 80 secured to the motor shaft either outside the bearing 64, as shown, or between said bearing and the motor. The brake levers 81 carry brake shoes adapted to be applied to the pulle 80. Springs may be employed to apply t e brake shoes and an electromagnet to release them, as shown in the brake mechanism B, or any other suitable construction may be employed.

The end of the motor shaft on which the sheave S is 4mounted is preferably extended beyond the sheave and journaled in a standard 83. This reduces the strain on the mo tor shaft and results in a much more even distribution of the load on the bearings than when the standard 83 is omitted.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of our invention as defined by the claim. We Wish therefore not to be limited to the precise construction herein disclosed.

What we claim and desire to have protected by Letters Patent of the United States is The combination with a standard or support, ofA a shaft having bearings therein, a brake wheel on said shaft, brake levers, a brake-releasing magnet, a bracket on the magnet frame between said frame and the brake wheel, sup-porting rods secured to the bracket, and, brake springs supported by said rods.

In testimony whereof We have signed our 'naines to this specification in the presence of subscribing Witnesses.

DAVID L. LINDQmsT. ALLEN o. sMiTn.

Witnesses 4JOHN F. RULE,

MARGARET L. BEAM.

l GRIFFITH JOHN. Witnesses: n

Jon B. FURMAN, C. BLUlN. 

